99869979 has 16 divisors (see below), whose sum is σ = 151582464. Its totient is φ = 57895200.

The previous prime is 99869977. The next prime is 99869981. The reversal of 99869979 is 97996899.

It is an interprime number because it is at equal distance from previous prime (99869977) and next prime (99869981).

It is not a de Polignac number, because 99869979 - 2¹ = 99869977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99869977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65032 + ... + 66549.

It is an arithmetic number, because the mean of its divisors is an integer number (9473904).

Almost surely, 2^99869979 is an apocalyptic number.

99869979 is a deficient number, since it is larger than the sum of its proper divisors (51712485).

99869979 is a wasteful number, since it uses less digits than its factorization.

99869979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131618.

The product of its digits is 19840464, while the sum is 66.

The square root of 99869979 is about 9993.4968354425. The cubic root of 99869979 is about 463.9576281041.

Subtracting from 99869979 its reverse (97996899), we obtain a triangular number (1873080 = T₁₉₃₅).

It can be divided in two parts, 99 and 869979, that added together give a palindrome (870078).

The spelling of 99869979 in words is "ninety-nine million, eight hundred sixty-nine thousand, nine hundred seventy-nine".